Assuming you ahve all articles in both languages... I would probably split it into two scans:

http://www.example.com/en/

http://www.example.com/el/

(If your sitte has a more complicated URL system, you can also look into using "analysis" and "outtput" filters to control the crawl and output very precisely of each scan)

I would then submit an image sitemap for both. To be honest though, I am not 100% sure what Google would prefer... And even if I did, I would not be sure it would still be what they would preger the next month

Assuming you ahve all articles in both languages... I would probably split it into two scans:

http://www.example.com/en/

http://www.example.com/el/

(If your sitte has a more complicated URL system, you can also look into using "analysis" and "outtput" filters to control the crawl and output very precisely of each scan)

I would then submit an image sitemap for both. To be honest though, I am not 100% sure what Google would prefer... And even if I did, I would not be sure it would still be what they would preger the next month

Thank for the answer.

Yes all the articles are in both languages

I did tried the above but it cannot crawl the images. I have erased disallow media in robots as well but after several scans I didn't have any image in the results.